Yeah, these 1389s aren't that common. Here are some more pictures. The only other I know of that has a similar loading gate is the Daisy 747 which is a single pump target gun.
I have this one.Has the green shoulder stock also.
I just saw this I have a couple like it, on I modded the valve and got 800fps with 15 pumps but the loading gate broke due to the increased pressure. Now I fixed it and stick with less fps and pumps as I don't want to break it again. I like that green a lot better that the black versions. I have both and a few 1399 stocks that are different shades. I wish I could get the forearm for the 2250 in matching color. I like the old stuff and new stuff. I have about 115 airguns now.